We are a leading provider of quick-opening closures, threaded closures, internal door closures, clamp-style closures, and accessories to the oil and gas industry. These products are used throughout the global midstream distribution and transmission markets.

Our Hercules™ products are recognized for their superior quality and design and being unsurpassed in the oilfield. From the largest range of stuffing boxes and production blowout preventers (BOPs) to the most comprehensive line of polished rod accessories, Hercules equipment can complete a total hookup.

For more information on the NOV products offered by Flow-Zone please find the Flow-Zone Location Nearest You.